21120110001211 has 4 divisors (see below), whose sum is σ = 22744733847472. Its totient is φ = 19495486154952.

The previous prime is 21120110001197. The next prime is 21120110001239. The reversal of 21120110001211 is 11210001102112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21120110001211 - 2¹³ = 21120109993019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1624623846247 = 21120110001211 / (2 + 1 + 1 + 2 + 0 + 1 + 1 + 0 + 0 + 0 + 1 + 2 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 21120110001191 and 21120110001200.

It is not an unprimeable number, because it can be changed into a prime (21120110001311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812311923111 + ... + 812311923136.

It is an arithmetic number, because the mean of its divisors is an integer number (5686183461868).

Almost surely, 2^{21120110001211} is an apocalyptic number.

21120110001211 is a deficient number, since it is larger than the sum of its proper divisors (1624623846261).

21120110001211 is a wasteful number, since it uses less digits than its factorization.

21120110001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624623846260.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21120110001211 its reverse (11210001102112), we get a palindrome (32330111103323).

The spelling of 21120110001211 in words is "twenty-one trillion, one hundred twenty billion, one hundred ten million, one thousand, two hundred eleven".